The Sky is the Limit for Brighton's New Attraction page 5 of 5
Cans numbers 12, 13, 14, 15, 16, 17 and one and
two are now in place, with nine more cans on site
Those cans will be inserted during seven jacking sessions – with some of the smaller cans planned to be fitted together prior to jacking.
Those workings include a cable jacking systems which is attached to a 16 tonne steel collar which fits over the cans and is used to lift the cans up in order for the next can to be placed underneath.
During each jacking session, the steel collar is lowered within the jacking tower and attached to a can.
Four strand jacks, each with a lifting capacity of 450 tonnes, then gradually jack up the cans stacked above, high enough so a new section of tower can be slid underneath. The first jacking session saw the tower lift 315 tonnes and the final lift will be almost 1,000 tonnes.
Each jacking session takes a few hours and the engineering team is also cladding each section of tower prior to it being jacked and appearing out of the top of the jacking tower.
The jacking tower is broken up into different levels – with the cladding room the level nearest the roof. Inside a team from James and Taylor, the specialist cladding firm, is meticulously adding perforated panels to the side of each tower can.
The cladding is an important part of the tower and more than 320 panels of cladding will be added in this room over the next few months.
Groundforce supports for i360
Groundforce supplied its Mega Brace system with MP125 and MP150 props to a help with construc tion of a new landmark building in Brighton.
Groundforce was employed by civils subcon tractor Mackley to support the sides of the 25 m x 25 m x 7 m deep excavation in which the massive concrete foundations are cast.
We have installed secant piles through the loose ballast and sand and 5 m into the underlying chalk. Inside this exca vation we are casting a reinforced concrete base comprising 1,900 m³ of concrete and 190 tonnes of steel rebar.
says Mackley project manager, Dan Argles.
Embedded within this slab is a 5 m diameter, 22 tonne steel ring onto which the 162 m-high tower is fixed with over 80 massive bolts. To support the sides of this excavation, Ground force installed its Mega Brace hydraulic frame as a waling beam around the top of the piled retaining wall.
Four hydraulic modular props were installed as knee-braces across each of the four corners. This left the centre of the excavation clear so that instal lation of the tower sections could be carried out unimpeded.